ISO INTERNATIONAL STANDARD
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1 INTERNATIONAL STANDARD ISO First edition Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings Part 3: Permissible operational parameters Paliers lisses hydrodynamiques radiaux fonctionnant en régime stabilisé Paliers circulaires cylindriques Partie 3: Paramètres opérationnels admissibles A Reference number ISO :1998(E)
2 ISO :1998(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and nongovernmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard ISO was prepared by Technical Committee ISO/TC 123, Plain bearings, Subcommittee SC 4, Methods of calculation of plain bearings. ISO 7902 consists of the following parts, under the general title Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings: Part 1: Calculation procedure Part 2: Functions used in the calculation procedure Part 3: Permissible operational parameters Annex A of this part of ISO 7902 is for information only. ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genève 20 Switzerland Internet central@iso.ch X.400 c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii
3 ISO ISO :1998(E) Introduction In order to attain sufficient operational reliability of circular cylindrical plain journal bearings when calculated in accordance with ISO , it is essential that the calculated operational parameters h min, T B or T ex and p do not lie above or below the permissible operational parameters h lim, T lim and p lim. The permissible parameters represent geometrically and technologically dependent operational limits within the plain bearing tribological system. They are empirical values which still enable sufficient operational reliability even for minor influences (see ISO ). ii
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5 INTERNATIONAL STANDARD ISO ISO :1998(E) Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings Part 3: Permissible operational parameters 1 Scope This part of ISO 7902 specifies empirical permissible values for h lim, T lim and p lim. The empirical values stated can be modified for certain applications, for example if information supplied by the manufacturer is to be taken into account. The descriptions of the symbols and calculation examples are given in ISO Normative reference The following standard contains provisions which, through reference in this text, constitute provisions of this part of ISO At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this part of ISO 7902 are encouraged to investigate the possibility of applying the most recent edition of the standard indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO :1998, Hydrodynamic plain journal bearings under steady-state conditions Circular cylindrical bearings Part 1: Calculation procedure. 3 Operational parameters to avoid wear 3.1 The aim of keeping above the minimum permissible lubrication film thickness h lim is to retain complete lubrication of the plain bearing in order to attain least possible wear and low susceptibility to faults. The lubricant should be free of contaminating particles, otherwise increased wear, scoring and local overheating can result, thus impairing correct functioning of the plain bearing. If necessary, appropriate filtering of the lubricant should be provided for. 3.2 The minimum permissible lubrication film thickness h lim, as a characteristic parameter for the transition to mixed friction (see ISO :1998, 6.6), can be determined from the following equation: 1 1 hlim = RzB + RzJ + By + y + hwav,eff (1) 1
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